// Copyright (C) 2024 EA group inc.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

#pragma once

#include <ostream>
#include <type_traits>
#include <utility>
#include <turbo/base/macros.h>

namespace turbo {

    // Detects if type `T` supports streaming to `std::ostream`s with `operator<<`.

    template<typename T, typename = void>
    struct HasOstreamOperator : std::false_type {
    };

    template<typename T>
    struct HasOstreamOperator<
            T, std::enable_if_t<std::is_same<
                    std::ostream &, decltype(std::declval<std::ostream &>()
                            << std::declval<const T &>())>::value>>
            : std::true_type {
    };

}  // namespace turbo
